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Research Letter
February 2018

Assessment of the Diameter of Pigmented Skin Lesions With and Without a Ruler

Author Affiliations
  • 1Northwestern University Feinberg School of Medicine, Department of Dermatology, Chicago, Illinois
  • 2Editor, JAMA Dermatology
JAMA Dermatol. 2018;154(2):221-223. doi:10.1001/jamadermatol.2017.5083

Assessing skin lesion diameter is a key component of the ABCDE (Asymmetrical shape, Border, Color, Diameter, and Evolution) criteria to evaluate lesions concerning for melanoma.1 To our knowledge, the ability of medical trainees and practitioners to estimate lesion size with and without the aid of a ruler has not been previously described. This study seeks to determine the accuracy with which medical students, internal medicine residents, and dermatology residents, fellows, and faculty can estimate the diameter of skin lesions in clinical photographs.

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